| Difficult Run to Beyne-Heusay | 3,933.86 mi (6,330.93 km) |
| Difficult Run to Bierbeek | 3,892.44 mi (6,264.27 km) |
| Difficult Run to Bilzen | 3,921.81 mi (6,311.55 km) |
| Difficult Run to Binche | 3,879.33 mi (6,243.18 km) |
| Difficult Run to Bissegem | 3,830.00 mi (6,163.78 km) |
| Difficult Run to Blankenberge | 3,813.97 mi (6,137.98 km) |
| Difficult Run to Blegny | 3,935.88 mi (6,334.19 km) |
| Difficult Run to Bocholt | 3,916.25 mi (6,302.59 km) |
| Difficult Run to Boechout | 3,872.82 mi (6,232.71 km) |
| Difficult Run to Bonheiden | 3,877.83 mi (6,240.77 km) |
| Difficult Run to Boom | 3,869.83 mi (6,227.90 km) |
| Difficult Run to Boortmeerbeek | 3,880.47 mi (6,245.01 km) |
| Difficult Run to Borgerhout | 3,869.53 mi (6,227.40 km) |
| Difficult Run to Borgloon | 3,916.54 mi (6,303.05 km) |
| Difficult Run to Bornem | 3,864.03 mi (6,218.55 km) |
